diff --git a/usr.sbin/rpcbind/rpcb_svc_com.c b/usr.sbin/rpcbind/rpcb_svc_com.c
index 2ee2a4c7d87e..5c6b8dddc71b 100644
--- a/usr.sbin/rpcbind/rpcb_svc_com.c
+++ b/usr.sbin/rpcbind/rpcb_svc_com.c
@@ -634,7 +634,7 @@ rpcbproc_callit_com(struct svc_req *rqstp, SVCXPRT *transp,
 	/*
 	 * Should be multiple of 4 for XDR.
 	 */
-	sendsz = ((sendsz + 3) / 4) * 4;
+	sendsz = roundup(sendsz, 4);
 	if (sendsz > RPC_BUF_MAX) {
 #ifdef	notyet
 		buf_alloc = alloca(sendsz);		/* not in IDR2? */